Not gonna lie, I cannot stand artosis speaking for 30 minutes straight. I have to watch this in parts. If you already watch it, give a short summary of what they talked about.

Didn't miss much. Just a lot of vague high level talk about balance. Specifics were focused on imbalances that no long exist (like 2armor 1 supply roaches), and some talk about how the colossus is too important to protoss army compositions.

Colossus are somewhat OP because Protoss always get Colossus late game.

PvP - Colossus control the PvP matchup - this seems odd and weird. Can't we have some other options?
PvZ - Colossus force Zerg to use their 300 army count army to beat them (IE, sacrifice all your shit and remax to finish off the protoss army). This is largely because Corruptors blow. Vikings range makes colossus less impressive in PvT. Corruptors range is not long enough and forces both corruptors and ground armies to eat shit when protoss and zerg armies collide.
PvT - Vikings and Tanks (although they didn't mention tanks) balance the colossus in PvT. Therefore, PvT is the most balanced matchup.

Artosis thinks he's a pro gamer still... I haven't heard anything of his play recently. =p